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Surf Forecasts:
Katagai surfForecast / Chiba / Japan
48hr Weather and Surf, issued 2 am Saturday 18 Apr 2026 JSTForecast update in hr min s Forecast update imminent
Katagai surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Katagai sea temperature is
16.4° C
(Which is 1.5°C colder than average for this time of year)How big are the waves at Katagai today?
The current surf forecast for Katagai at 10AM is: 1.8m 16s primary swell from a Southeast direction and 1.2m 11s secondary swell from a East direction (forecast issued at 02:00am April 18). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Apr) | 6ft (1.8m) | 16s |
| Afternoon (18 Apr) | 6ft (1.8m) | 16s |
| Evening (18 Apr) | 6ft (1.8m) | 15s |
Table - waves today at Katagai. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 18 | Sunday 19 | Monday 20 | ||||||||||||||||||||||
| 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    | |||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 13 | 13 | 13 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 1461 | 1536 | 1611 | 1611 | 1611 | 1571 | 1271 | 1453 | 1380 | 1441 | 1402 | 1382 | 1505 | 1526 | 1760 | 1959 | 2038 | 2010 | 1956 | 1572 | 1387 | 1280 | 1067 | 1034 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | glass | glass | glass | cross- on | on | cross- on | cross- on | cross | off | glass | cross | cross- on | cross- on | cross- on | cross- on | cross | cross | cross | cross- on | cross- on | cross- on | on | on |
High Tide / height (m) | 3:49AM 1.45 | 5:19PM 1.42 | 4:12AM 1.50 | 6:08PM 1.38 | 4:38AM 1.53 | 7:00PM 1.30 | ||||||||||||||||||
Low Tide / height (m) | 10:10PM 0.67 | 10:34AM 0.08 | 10:41PM 0.78 | 11:13AM 0.00 | 11:10PM 0.89 | 11:54AM -0.01 | ||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | ||||||||||||||||||||||
| Sunrise | - | - | 5:03 | - | - | - | - | - | - | - | 5:01 | - | - | - | - | - | - | - | 5:00 | - | - | - | - | - |
| Sunset | - | - | - | - | - | - | 6:12 | - | - | - | - | - | - | - | 6:13 | - | - | - | - | - | - | - | 6:14 | - |
 | |  | |  | | |  | |  | | | | | | | | | | | | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 14 | 14 | 14 | 16 | 17 | 17 | 17 | 17 | 16 | 16 | 15 | 17 | 18 | 18 | 17 | 16 | 16 | 16 | 15 | 16 | 17 | 17 | 17 | 17 |
| Feels °C (?) | 12 | 14 | 14 | 15 | 15 | 14 | 15 | 17 | 16 | 16 | 15 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 13 | 13 | 14 | 14 | 15 | 15 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Katagai surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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